Welcome to 100DollarGPS where you'll find hundreds of the top brand name GPS and navigation systems all priced below $100. Our software compiles the lowest priced GPS system auctions on a daily basis, so you'll get the best deal with new inventory every day. We offer GPS Systems from all of the top manufacturers including Garmin, Magellan, Alpine, Tom Tom, Uniden and many more.
Today's GPS Auctions
 High Quality Standard 4ft USB 20 Cable A Male to Mini B For Camera MP3 PS3 GPS  US $1.25
|
 8L3T10E893AA OEM Ford Factory GPS Navigation Antenna 2007 2008 F 150 US $75.00
|
 GPS ANTENA AND MIC SET CABLE FOR UNIT UNKNOWN BRAND USED WORKING CONDITION US $.99
|
 SkyGolf SkyCaddie SG3 Sports GPS Receiver US $30.00
|
 Car Mount Cradle Dock Holder for Garmin Nuvi 30 40 40LM 50 50 LM GPS Navigation US $6.71
|
 Magellan Maestro 4700 Automotive GPS Receiver US $64.99
|
 Versatile Columbia 100 Cotton GPS Performance Shorts Size 12 New With Tags US $20.00
|
 Delorme Earthmate GPS With Street Atlas 2004 US $25.00
|
 TomTom 14644 Automotive GPS Receiver US $14.99
|
 Garmin StreetPilot c340 Automotive GPS Receiver US $25.99
|
 Car Charger for Garmin Nuvi GPS 200 255 370 670 770 755 860 900T 1200 1300 1450 US $3.29
|
 Strong Windshield GPS CAR MOUNT Holder Cradle for Garmin Nuvi 255 255W 43 US $8.80
|
 Garmin Nuvi 1450LMT GPS Receiver US $93.00
|
 Magellan RoadMate 3120 MU Automotive GPS Receiver US $30.50
|
 UNIVERSAL GPS CAR VEHICLE CHARGER US $6.50
|
 CASIO EXILIM C721 WATERPROOF MILITARY CAMERA VCAST GPS VERIZON PHONE NO CONTRACT US $22.01
|
 Rapid Fast Travel Battery Home Wall AC GPS Charger for Garmin Nuvi 1390 1390T US $1.99
|
 35 GPS Travel CASE BAG FOR GARMIN NUVI 200 250 260 265T 270 275T 350 360 370 US $5.24
|
 Garmin nuvi 255W GPS Receiver 2012 N AMERICA MAPS bundle with accesories US $49.00
|
 windshield window car vehicle mount holder vent mount for Garmin nuvi 43 gps US $8.80
|
What is GPS?
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense. GPS was originally intended for military applications, but in the 1980s, the government made the system available for civilian use. GPS works in any weather conditions, anywhere in the world, 24 hours a day. There are no subscription fees or setup charges to use GPS.
How it works
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
The GPS satellite system
The 24 satellites that make up the GPS space segment are orbiting the earth about 12,000 miles above us. They are constantly moving, making two complete orbits in less than 24 hours. These satellites are travelling at speeds of roughly 7,000 miles an hour.
GPS satellites are powered by solar energy. They have backup batteries onboard to keep them running in the event of a solar eclipse, when there's no solar power. Small rocket boosters on each satellite keep them flying in the correct path.
Here are some other interesting facts about the GPS satellites (also called NAVSTAR, the official U.S. Department of Defense name for GPS):
The first GPS satellite was launched in 1978.
A full constellation of 24 satellites was achieved in 1994.
Each satellite is built to last about 10 years. Replacements are constantly being built and launched into orbit.
A GPS satellite weighs approximately 2,000 pounds and is about 17 feet across with the solar panels extended.
Transmitter power is only 50 watts or less.